Determination of xanthine and guanine in microgram quantities.
D006147:Guanine / Q000032:analysis*; D008722:Methods; D008832:Microchemistry; D009696:Nucleic Acids / Q000378:metabolism*; D014970:Xanthines / Q000032:analysis*
D009696:Nucleic Acids; D014970:Xanthines; D006147:Guanine